| 4-2.3(3) Structures |
Added requirement to position CBs away from pollutant-generating sources to facilitate source control. |
| 4-2.7 Required Notes for Storm Drainage Plans |
Added standard note #8. |
| 4-4.2(3) Access to Underground Facilities |
Added clarification that access lids must be surrounded by 1-ft minimum pavement, lawn, pavers, or similar. Access lids in gravel, mulch, or similar cause materials to fall in and lids to not seat properly. |
| 4-4.4(3) Detention Vaults |
Added #6: All metal parts inside vaults shall be aluminum or stainless steel. No galvanized steel shall be allowed. (This applies to all vault parts but is in response to Ecology 2019 SWMMWW Figure V-12.16 which shows a galvanized floor grate; this is not permitted.) |
| 4-4.4(4) Alternate Detention Facilities |
Added requirements for alternate detention facilities prior to permitting and during construction. |
| 4-5 Stormwater Source Control |
Section revised to provide clarification on source control requirements. |
| DCSS 5-7.4(5) Trench Excavation |
Excavation method |
| 5.8.5 Connections to Existing Mains |
Edited for clarity |